# Boeing Alert Service Bulletin 747-23A2628: No revision named

- Rights: © The Boeing Company. Filed by the FAA in regulations.gov docket FAA-2025-3422, the docket of AD 2026-10-14. Not covered by OpenAirDocs’ CC0 dedication.
- Document: [Boeing Alert Service Bulletin 747-23A2628](https://openairdocs.org/service-documents/boeing/747-23a2628.md)
- Title as filed: 747-23A2628-00-RB
- Pages: 36
- PDF: https://openairdocs.org/files/sha256/71/9b/719b9826a135b300c5c86027883d82aae198417d5de6fc2f235d8b499b9674b6
- Page: https://openairdocs.org/service-documents/boeing/747-23a2628/file/719b9826a135

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### Page 1

Commercial 
Airplanes
747
Requirements Bulletin
ALERT
Number: 747-23A2628 RB
Original Issue: April 18, 2025
ATA System: 2325
SUBJECT: COMMUNICATIONS - Satellite Communications (SATCOM) System - SATCOM High
Gain Antenna Adapter Plate Inspection and Change
EXPORT CONTROLLED - This technology or software is subject to the U.S. Export Administration Regulations
(EAR), (15 C.F.R. Parts 730-774). No authorization from the U.S. Department of Commerce is required for
export, re-export, in-country transfer, or access EXCEPT to country group E:1 or E:2 countries/persons per
Supp.1 to Part 740 of the EAR.
9E991ECCN:
Copyright © 2025 The Boeing Company
Treatment of this document and its content is governed by contract with Boeing. Rights to use this document
are licensed on a per aircraft basis and such rights may not be transferable. For more information, contact The
Boeing Company.
Boeing, the Boeing signature, the Boeing symbol, 707, 717, 727, 737, 747, 757, 767, 777, 787, Dreamliner,
BBJ, DC-8, DC-9, DC-10, KC-10, KC-46, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8, Poseidon and
Boeing liveries are all trademarks owned by The Boeing Company; and no trademark license is granted in
connection with this document unless provided in writing by Boeing.
Original Issue: April 18, 2025
747-23A2628 RB
1 of 36
2.0

### Page 2

Export Controlled ECCN: 9E991
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Original Issue: April 18, 2025
747-23A2628 RB
2 of 36
REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT
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### Page 3

Table of Contents
1. EFFECTIVITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
A. Airplanes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
B. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2. CONCURRENT REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3. COMPLIANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4. APPROVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
A. General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
B. Work Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
FIGURE 1: SATELLITE COMMUNICATIONS (SATCOM) HIGH GAIN ANTENNA - ADAPTER PLATE -
DETAILED INSPECTION [Group 1, Configuration 2, 4] . . . . . . . . . . . . . . . . . . . 35
FIGURE 2: SATELLITE COMMUNICATIONS (SATCOM) HIGH GAIN ANTENNA - ADAPTER PLATE -
DETAILED INSPECTION [Group 1, Configuration 3-4] . . . . . . . . . . . . . . . . . . . 36
Export Controlled ECCN: 9E991
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Original Issue: April 18, 2025
747-23A2628 RB
3 of 36
REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT

### Page 4

Export Controlled ECCN: 9E991
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Original Issue: April 18, 2025
747-23A2628 RB
4 of 36
REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT
BLANK PAGE

### Page 5

Commercial 
Airplanes
747
Requirements Bulletin
ALERT
Number: 747-23A2628 RB
Original Issue: April 18, 2025
ATA System: 2325
SUBJECT: COMMUNICATIONS - Satellite Communications (SATCOM) System - SATCOM High
Gain Antenna Adapter Plate Inspection and Change
THIS DOCUMENT IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN
EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS DOCUMENT TO THE NEW
OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS DOCUMENT TO THE NEW OWNER.
THIS IS AN ENHANCED REQUIRED FOR COMPLIANCE DOCUMENT. THE BOEING PROCESSES USED
TO CREATE THE SERVICE BULLETIN (SB) AND THE REQUIREMENTS BULLETIN (RB) ENSURE THAT
THE INFORMATION BETWEEN "RC START" AND "RC END" IN THE SB ARE IDENTICAL TO THE
INFORMATION IN THE SAME SECTIONS (COMPLIANCE, WORK INSTRUCTIONS…) OF THE RB WHICH
THE SB REFERS TO AS THE RELATED DOCUMENT.
1. Effectivity
A. Airplanes
This bulletin is applicable to 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F,
747-300, 747-400, 747-400D, 747-400F, 747SP, 747SR Airplane(s), line number(s) 1-1419 in 1
Group(s). Where the effectivity is presented with hyphens between line numbers, the airplane
applicability means "through" and "inclusive", e.g. line numbers 1-9 means line numbers 1 through
9 inclusive.
The Variable Numbers and Group Information for the applicable airplanes is given below.
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: April 18, 2025
747-23A2628 RB
5 of 36

### Page 6

DESCRIPTIONCONFIGURATIONGROUP
747-100/-100B/-100B SUD/-200B/-200C/-200F/-300/-400/-400D/
-400F/SP/SR airplanes.
-1
Airplanes not equipped with SATCOM High Gain Antenna Adapter
Plate(s) part number 100-602074-000 or 100-602549-000.
1
Airplanes equipped with SATCOM High Gain Antenna Adapter
Plate(s) part number 100-602074-000 and not equipped with part
number 100-602549-000.
2
Airplanes equipped with SATCOM High Gain Antenna Adapter
Plate(s) part number 100-602549-000 and not equipped with part
number 100-602074-000.
3
Airplanes equipped with SATCOM High Gain Antenna Adapter Plate
part number 100-602074-000 and part number 100-602549-000.
4
Airplane Models:
747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D,
747-400F, 747SP, 747SR
GroupVariable Number
1RA001 - RA034
1RA101 - RA115
1RA161 - RA164
1RA201 - RA203
1RA216 - RA217
1RA245 - RA246
1RA251 - RA266
1RA301 - RA318
1RA351 - RA360
1RA369 - RA373
1RA401 - RA418
1RA501 - RA502
1RA521 - RA528
1RA532 - RA548
1RA551 - RA552
1RA559 - RA561
GroupVariable Number
1RA581 - RA582
1RA585
1RA601 - RA602
1RA631 - RA635
1RA651 - RA652
1RA671 - RA677
1RA701 - RA702
1RA721 - RA731
1RA741 - RA745
1RA749 - RA750
1RA761 - RA762
1RA781 - RA784
1RA901 - RA916
1RB001 - RB016
1RB041 - RB044
1RB071 - RB075
GroupVariable Number
1RB101 - RB102
1RB411 - RB413
1RB421
1RB601 - RB607
1RB681 - RB697
1RB711
1RB721 - RB723
1RB741 - RB748
1RD001 - RD004
1RD021 - RD022
1RD041 - RD059
1RD071 - RD072
1RD081 - RD083
1RD091 - RD092
1RD101 - RD104
1RD121 - RD127
Export Controlled ECCN: 9E991
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Original Issue: April 18, 2025
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REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT

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GroupVariable Number
1RD131 - RD144
1RD166 - RD167
1RD171 - RD172
1RD181 - RD183
1RD201 - RD204
1RD221 - RD227
1RD231 - RD235
1RD241 - RD243
1RD251 - RD262
1RD271 - RD272
1RD291 - RD292
1RD301 - RD302
1RD311
1RD351 - RD358
1RD361 - RD366
1RD381 - RD383
1RD411 - RD414
1RD421 - RD426
1RD431 - RD435
1RD441 - RD442
1RD451 - RD456
1RD461
1RD471 - RD475
1RD513 - RD519
1RD531 - RD533
1RD551
1RD561
1RD571
1RD581 - RD583
1RD591 - RD593
1RD601 - RD607
1RD621 - RD623
1RD641 - RD649
GroupVariable Number
1RD651 - RD659
1RD661
1RD671
1RD681 - RD682
1RD691 - RD692
1RD701 - RD702
1RD721 - RD722
1RD741 - RD742
1RD751 - RD755
1RD761
1RD771 - RD775
1RD781 - RD783
1RD791 - RD792
1RE001
1RF001 - RF006
1RG001 - RG009
1RG091
1RG095
1RG101 - RG104
1RG121 - RG126
1RG141 - RG142
1RG161 - RG164
1RG171 - RG174
1RG191 - RG193
1RG211 - RG213
1RG221 - RG222
1RH101 - RH102
1RH111 - RH112
1RH121 - RH122
1RJ131 - RJ133
1RJ151 - RJ152
1RJ301 - RJ303
1RJ321 - RJ322
GroupVariable Number
1RJ331 - RJ333
1RL401 - RL403
1RL411 - RL436
1RL451 - RL456
1RL461 - RL462
1RL471 - RL481
1RL491 - RL492
1RL501 - RL502
1RL511 - RL516
1RL521 - RL522
1RL531 - RL534
1RL551
1RL561 - RL568
1RL571 - RL572
1RL576 - RL577
1RL579
1RL581 - RL586
1RL651 - RL655
1RL671 - RL675
1RL681 - RL684
1RL751 - RL752
1RM001 - RM007
1RM010 - RM013
1RM021 - RM024
1RM026 - RM030
1RM036 - RM045
1RM051 - RM053
1RM071
1RM081 - RM084
1RM091
1RM096 - RM097
1RM116 - RM117
1RM126 - RM132
Export Controlled ECCN: 9E991
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Original Issue: April 18, 2025
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REQUIREMENTS BULLETIN 747-23A2628
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### Page 8

GroupVariable Number
1RM136 - RM147
1RM156 - RM158
1RM166 - RM177
1RM191 - RM192
1RM231 - RM233
1RM241 - RM246
1RM261 - RM264
1RM316 - RM318
1RM331 - RM333
1RM341
1RM351 - RM355
1RM366 - RM367
1RM401 - RM403
1RM426
1RM431
1RM441 - RM443
1RM445
1RM801 - RM803
1RM811 - RM813
1RM851 - RM859
1RM861 - RM863
1RM871 - RM899
1RM901 - RM906
1RM911
1RR001 - RR005
1RR021 - RR025
1RR031
1RR201 - RR206
1RR221 - RR226
1RR261 - RR267
1RR301 - RR310
1RR331 - RR332
1RR336
GroupVariable Number
1RR341 - RR345
1RR361 - RR362
1RR421 - RR422
1RR431 - RR432
1RR441 - RR442
1RR451
1RR501 - RR504
1RR521 - RR522
1RR526
1RR531
1RR551 - RR556
1RR561
1RR566
1RR701
1RR721 - RR724
1RR746 - RR748
1RR851 - RR856
1RR861 - RR862
1RR951 - RR952
1RS001 - RS002
1RS201
1RS211 - RS212
1RS221 - RS222
1RS231 - RS241
1RS251 - RS259
1RS263
1RS265 - RS268
1RS271 - RS276
1RS291 - RS292
1RS301 - RS306
1RS311 - RS320
1RS331 - RS333
1RS341 - RS342
GroupVariable Number
1RS699
1RS701 - RS703
1RS711 - RS713
1RS721 - RS722
1RS731 - RS732
1RS741 - RS743
1RS751 - RS752
1RS761 - RS762
1RS771
1RS781 - RS782
1RS786
1RT001 - RT014
1RT021 - RT022
1RT031 - RT035
1RT041 - RT047
1RT061
1RT071 - RT075
1RT101 - RT103
1RT121
1RT131 - RT137
1RT151 - RT152
1RT161 - RT168
1RT401 - RT412
1RT431 - RT447
1RT451 - RT469
1RT471 - RT499
1RT501 - RT535
1RT551 - RT568
1RT571 - RT591
1RT601 - RT657
1RT671 - RT673
1RT681 - RT682
1RT691 - RT699
Export Controlled ECCN: 9E991
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Original Issue: April 18, 2025
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REQUIREMENTS BULLETIN 747-23A2628
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### Page 9

GroupVariable Number
1RT701 - RT704
1RT711 - RT717
1RT741 - RT757
1RT776 - RT777
1RT781 - RT784
1RT801 - RT803
1RT811 - RT814
1RT831 - RT837
GroupVariable Number
1RT861 - RT864
1RT876 - RT880
1RT931 - RT932
1RT945 - RT949
1RT951 - RT955
1RT966 - RT967
1RU001 - RU006
1RU016 - RU017
GroupVariable Number
1RU031 - RU032
1RU051 - RU052
1RU059 - RU062
1RU081 - RU083
1RU101 - RU102
1RU121 - RU132
1RU801 - RU809
1RU831 - RU841
B. Spares Affected
None.
2. CONCURRENT REQUIREMENTS
None.
3. COMPLIANCE
The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to
Requirements Bulletin 747-23A2628 RB. The Airworthiness Directive will make the compliance tasks and
times given in Requirements Bulletin 747-23A2628 RB mandatory.
Accomplish the required action(s), based on the applicable condition(s) in Table(s) 1, 2, 3, and 4 in
accordance with Accomplishment Instructions.
The Conditions, Actions and Compliance times shown apply to each adapter plate location independently.
When more than one OPTION is given for a CONDITION, do only one of the OPTION numbers. When
more than one ACTION is given for a CONDITION or an OPTION, do all of the ACTION numbers for that
CONDITION or OPTION.
Group 1, Configuration 1:
No work is necessary.
Any airplane that installs SATCOM High Gain Antenna Adapter Plate part number 100-602074-000 and
does not install part number 100-602549-000 after the Original Issue date of Requirements Bulletin
747-23A2628 RB, must comply with the requirements specified in Group 1, Configuration 2.
Any airplane that installs SATCOM High Gain Antenna Adapter Plate part number 100-602549-000 and
does not install part number 100-602074-000 after the Original Issue date of Requirements Bulletin
747-23A2628 RB, must comply with the requirements specified in Group 1, Configuration 3.
Any airplane that installs SATCOM High Gain Antenna Adapter Plate part number 100-602074-000 and
part number 100-602549-000 after the Original Issue date of Requirements Bulletin 747-23A2628 RB, must
comply with the requirements specified in Group 1, Configuration 4.
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: April 18, 2025
747-23A2628 RB
9 of 36
REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT

### Page 10

Group 1, Configuration 2, 4:
Table 1: Satellite Communications (SATCOM) High Gain Antenna Adapter Plate Inspection
Repeat Interval
(Not to Exceed)
Boeing Recommended
Compliance Time
ActionCondition
-Within 12 months after
the Original Issue date of
Requirements Bulletin
747-23A2628 RB.
At the location(s) where part number 100-
602074-000 is installed, do a Detailed
Inspection (DET) of the SATCOM High
Gain Antenna Adapter Plate for corrosion.
Airplanes with SAT-
COM High Gain Anten-
na Adapter Plate(s)
with part number 100-
602074-000 that have
been installed for 20
years or more as of the
Original Issue date of
Requirements Bulletin
747-23A2628 RB, or
the installation date
cannot be determined.
48 months.-At the location(s) where part number 100-
602074-000 is installed, repeat the DET
of the SATCOM High Gain Antenna
Adapter Plate for corrosion. (d)
CONDITION 1: NO
CORROSION FOUND
-Before further flight.OPTION 1 (ACTION 1): Repair the SAT-
COM High Gain Antenna Adapter Plate.
CONDITION 2: ANY
CORROSION FOUND
THAT IS LESS THAN
OR EQUAL TO 0.005
INCH IN DEPTH (a)
48 months.-OPTION 1 (ACTION 2): At the location(s)
where part number 100-602074-000 is
installed, repeat the DET of the SATCOM
High Gain Antenna Adapter Plate for
corrosion. (d)
-Before further flight.OPTION 2 (ACTION 1): Replace the
SATCOM High Gain Antenna Adapter
Plate with a serviceable SATCOM High
Gain Antenna Adapter Plate. (b)(c)
48 months.-OPTION 2 (ACTION 2): At the location(s)
where part number 100-602074-000 is
installed, repeat the DET of the SATCOM
High Gain Antenna Adapter Plate for
corrosion. (d)
-Before further flight.OPTION 3 (ACTION 1): Replace the
SATCOM High Gain Antenna Adapter
Plate with a new SATCOM High Gain
Antenna Adapter Plate. (c)
96 months.-OPTION 3 (ACTION 2): At the location(s)
where part number 100-602074-000 is
installed, repeat the DET of the SATCOM
High Gain Antenna Adapter Plate for
corrosion. (d)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: April 18, 2025
747-23A2628 RB
10 of 36
REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT

### Page 11

Group 1, Configuration 2, 4:
Table 1: Satellite Communications (SATCOM) High Gain Antenna Adapter Plate Inspection
Repeat Interval
(Not to Exceed)
Boeing Recommended
Compliance Time
ActionCondition
-Before further flight.OPTION 1 (ACTION 1): Replace the
SATCOM High Gain Antenna Adapter
Plate with a serviceable SATCOM High
Gain Antenna Adapter Plate. (b)(c)
CONDITION 3: ANY
CORROSION FOUND
THAT IS GREATER
THAN 0.005 INCH IN
DEPTH (a) 48 months.-OPTION 1 (ACTION 2): At the location(s)
where part number 100-602074-000 is
installed, repeat the DET of the SATCOM
High Gain Antenna Adapter Plate for
corrosion. (d)
-Before further flight.OPTION 2 (ACTION 1): Replace the
SATCOM High Gain Antenna Adapter
Plate with a new SATCOM High Gain
Antenna Adapter Plate. (c)
96 months.-OPTION 2 (ACTION 2): At the location(s)
where part number 100-602074-000 is
installed, repeat the DET of the SATCOM
High Gain Antenna Adapter Plate for
corrosion. (d)
(a) Adapter plate corrosion damage limitations can be found in CMC Electronics CMM 23-15-06, Original Issue,
dated April 16, 2024, or later revisions.
(b) A serviceable SATCOM adapter plate is one that has been inspected for corrosion and applicable on-
condition corrective actions has been done in accordance with Requirements Bulletin 747-23A2628 RB.
(c) Any airplane that installs SATCOM High Gain Antenna Adapter Plate part number 100-602549-000 and
does not install part number 100-602074-000 after the Original Issue date of Requirements Bulletin 747-
23A2628 RB, must comply with the requirements specified in Group 1, Configuration 3.
(d) The removal of SATCOM High Gain Antenna Adapter Plate part number 100-602074-000 after the Original
Issue date of Requirements Bulletin 747-23A2628 RB terminates the repeat DET inspection at the location(s)
where part number 100-602074-000 was removed.
Export Controlled ECCN: 9E991
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Original Issue: April 18, 2025
747-23A2628 RB
11 of 36
REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT

### Page 12

Group 1, Configuration 2, 4:
Table 2: Satellite Communications (SATCOM) High Gain Antenna Adapter Plate Inspection
Repeat Interval
(Not to Exceed)
Boeing Recommended
Compliance Time (Whichever
Occurs Later)
ActionCondition
-Within 96
months after
installation of a
new SATCOM
High Gain An-
tenna Adapter
Plate.
Within 24
months after
the Original Is-
sue date of Re-
quirements
Bulletin 747-
23A2628 RB.
At the location(s) where part num-
ber 100-602074-000 is installed,
do a Detailed Inspection (DET) of
the SATCOM High Gain Antenna
Adapter Plate for corrosion.
Airplanes with SAT-
COM High Gain Anten-
na Adapter Plate(s)
with part number 100-
602074-000 that have
been installed for less
than 20 years as of the
Original Issue date of
Requirements Bulletin
747-23A2628 RB.
48 months.-At the location(s) where part num-
ber 100-602074-000 is installed,
repeat the DET of the SATCOM
High Gain Antenna Adapter Plate
for corrosion. (d)
CONDITION 4: NO
CORROSION FOUND
Export Controlled ECCN: 9E991
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REQUIREMENTS BULLETIN 747-23A2628
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### Page 13

Group 1, Configuration 2, 4:
Table 2: Satellite Communications (SATCOM) High Gain Antenna Adapter Plate Inspection
Repeat Interval
(Not to Exceed)
Boeing Recommended
Compliance Time (Whichever
Occurs Later)
ActionCondition
-Before further flight.OPTION 1 (ACTION 1): Repair the
SATCOM High Gain Antenna
Adapter Plate.
CONDITION 5: ANY
CORROSION FOUND
THAT IS LESS THAN
OR EQUAL TO 0.005
INCH IN DEPTH (a) 48 months.-OPTION 1 (ACTION 2): At the lo-cation(s) where part number 100-
602074-000 is installed, repeat the
DET of the SATCOM High Gain
Antenna Adapter Plate for corro-
sion. (d)
-Before further flight.OPTION 2 (ACTION 1): Replace
the SATCOM High Gain Antenna
Adapter Plate with a serviceable
SATCOM High Gain Antenna
Adapter Plate. (b)(c)
48 months.-OPTION 2 (ACTION 2): At the lo-
cation(s) where part number 100-
602074-000 is installed, repeat the
DET of the SATCOM High Gain
Antenna Adapter Plate for corro-
sion. (d)
-Before further flight.OPTION 3 (ACTION 1): Replace
the SATCOM High Gain Antenna
Adapter Plate with a new SATCOM
High Gain Antenna Adapter Plate.
(c)
96 months.-OPTION 3 (ACTION 2): At the lo-
cation(s) where part number 100-
602074-000 is installed, repeat the
DET of the SATCOM High Gain
Antenna Adapter Plate for corro-
sion. (d)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: April 18, 2025
747-23A2628 RB
13 of 36
REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT

### Page 14

Group 1, Configuration 2, 4:
Table 2: Satellite Communications (SATCOM) High Gain Antenna Adapter Plate Inspection
Repeat Interval
(Not to Exceed)
Boeing Recommended
Compliance Time (Whichever
Occurs Later)
ActionCondition
-Before further flight.OPTION 1 (ACTION 1): Replace
the SATCOM High Gain Antenna
Adapter Plate with a serviceable
SATCOM High Gain Antenna
Adapter Plate. (b)(c)
CONDITION 6: ANY
CORROSION FOUND
THAT IS GREATER
THAN 0.005 INCH IN
DEPTH (a)
48 months.-OPTION 1 (ACTION 2): At the lo-
cation(s) where part number 100-
602074-000 is installed, repeat the
DET of the SATCOM High Gain
Antenna Adapter Plate for corro-
sion. (d)
-Before further flight.OPTION 2 (ACTION 1): Replace
the SATCOM High Gain Antenna
Adapter Plate with a new SATCOM
High Gain Antenna Adapter Plate.
(c)
96 months.-OPTION 2 (ACTION 2): At the lo-
cation(s) where part number 100-
602074-000 is installed, repeat the
DET of the SATCOM High Gain
Antenna Adapter Plate for corro-
sion. (d)
(a) Adapter plate corrosion damage limitations can be found in CMC Electronics CMM 23-15-06, Original Issue,
dated April 16, 2024, or later revisions.
(b) A serviceable SATCOM adapter plate is one that has been inspected for corrosion and applicable on-
condition corrective actions has been done in accordance with Requirements Bulletin 747-23A2628 RB.
(c) Any airplane that installs SATCOM High Gain Antenna Adapter Plate part number 100-602549-000 and
does not install part number 100-602074-000 after the Original Issue date of Requirements Bulletin 747-
23A2628 RB, must comply with the requirements specified in Group 1, Configuration 3.
(d) The removal of SATCOM High Gain Antenna Adapter Plate part number 100-602074-000 after the Original
Issue date of Requirements Bulletin 747-23A2628 RB terminates the repeat DET inspection at the location(s)
where part number 100-602074-000 was removed.
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: April 18, 2025
747-23A2628 RB
14 of 36
REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT

### Page 15

Group 1, Configuration 3-4:
Table 3: Satellite Communications (SATCOM) High Gain Antenna Adapter Plate Inspection
Repeat Interval
(Not to Exceed)
Boeing Recommended
Compliance Time
ActionCondition
-Within 12 months after
the Original Issue date of
Requirements Bulletin
747-23A2628 RB.
At the location(s) where part number 100-
602549-000 is installed, do a Detailed
Inspection (DET) of the SATCOM High
Gain Antenna Adapter Plate for corrosion.
Airplanes with SAT-
COM High Gain Anten-
na Adapter Plate(s)
with part number 100-
602549-000 that have
been installed for 20
years or more as of the
Original Issue date of
Requirements Bulletin
747-23A2628 RB, or
the installation date
cannot be determined.
48 months.-At the location(s) where part number 100-
602549-000 is installed, repeat the DET
of the SATCOM High Gain Antenna
Adapter Plate for corrosion. (d)
CONDITION 7: NO
CORROSION FOUND
-Before further flight.OPTION 1 (ACTION 1): Repair the SAT-
COM High Gain Antenna Adapter Plate.
CONDITION 8: ANY
CORROSION FOUND
THAT IS LESS THAN
OR EQUAL TO 0.005
INCH IN DEPTH (a)
48 months.-OPTION 1 (ACTION 2): At the location(s)
where part number 100-602549-000 is
installed, repeat the DET of the SATCOM
High Gain Antenna Adapter Plate for
corrosion. (d)
-Before further flight.OPTION 2 (ACTION 1): Replace the
SATCOM High Gain Antenna Adapter
Plate with a serviceable SATCOM High
Gain Antenna Adapter Plate. (b)(c)
48 months.-OPTION 2 (ACTION 2): At the location(s)
where part number 100-602549-000 is
installed, repeat the DET of the SATCOM
High Gain Antenna Adapter Plate for
corrosion. (d)
-Before further flight.OPTION 3 (ACTION 1): Replace the
SATCOM High Gain Antenna Adapter
Plate with a new SATCOM High Gain
Antenna Adapter Plate. (c)
96 months.-OPTION 3 (ACTION 2): At the location(s)
where part number 100-602549-000 is
installed, repeat the DET of the SATCOM
High Gain Antenna Adapter Plate for
corrosion. (d)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: April 18, 2025
747-23A2628 RB
15 of 36
REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT

### Page 16

Group 1, Configuration 3-4:
Table 3: Satellite Communications (SATCOM) High Gain Antenna Adapter Plate Inspection
Repeat Interval
(Not to Exceed)
Boeing Recommended
Compliance Time
ActionCondition
-Before further flight.OPTION 1 (ACTION 1): Replace the
SATCOM High Gain Antenna Adapter
Plate with a serviceable SATCOM High
Gain Antenna Adapter Plate. (b)(c)
CONDITION 9: ANY
CORROSION FOUND
THAT IS GREATER
THAN 0.005 INCH IN
DEPTH (a) 48 months.-OPTION 1 (ACTION 2): At the location(s)
where part number 100-602549-000 is
installed, repeat the DET of the SATCOM
High Gain Antenna Adapter Plate for
corrosion. (d)
-Before further flight.OPTION 2 (ACTION 1): Replace the
SATCOM High Gain Antenna Adapter
Plate with a new SATCOM High Gain
Antenna Adapter Plate. (c)
96 months.-OPTION 2 (ACTION 2): At the location(s)
where part number 100-602549-000 is
installed, repeat the DET of the SATCOM
High Gain Antenna Adapter Plate for
corrosion. (d)
(a) Adapter plate corrosion damage limitations can be found in CMC Electronics CMM 23-15-06, Original Issue,
dated April 16, 2024, or later revisions.
(b) A serviceable SATCOM adapter plate is one that has been inspected for corrosion and applicable on-
condition corrective actions has been done in accordance with Requirements Bulletin 747-23A2628 RB.
(c) Any airplane that installs SATCOM High Gain Antenna Adapter Plate part number 100-602074-000 and
does not install part number 100-602549-000 after the Original Issue date of Requirements Bulletin 747-
23A2628 RB, must comply with the requirements specified in Group 1, Configuration 2.
(d) The removal of SATCOM High Gain Antenna Adapter Plate part number 100-602549-000 after the Original
Issue date of Requirements Bulletin 747-23A2628 RB terminates the repeat DET inspection at the location(s)
where part number 100-602549-000 was removed.
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: April 18, 2025
747-23A2628 RB
16 of 36
REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT

### Page 17

Group 1, Configuration 3-4:
Table 4: Satellite Communications (SATCOM) High Gain Antenna Adapter Plate Inspection
Repeat Interval
(Not to Exceed)
Boeing Recommended
Compliance Time (Whichever
Occurs Later)
ActionCondition
-Within 96
months after
installation of a
new SATCOM
High Gain An-
tenna Adapter
Plate.
Within 24
months after
the Original Is-
sue date of Re-
quirements
Bulletin 747-
23A2628 RB.
At the location(s) where part num-
ber 100-602549-000 is installed,
do a Detailed Inspection (DET) of
the SATCOM High Gain Antenna
Adapter Plate for corrosion.
Airplanes with SAT-
COM High Gain Anten-
na Adapter Plate(s)
with part number 100-
602549-000 that have
been installed for less
than 20 years as of the
Original Issue date of
Requirements Bulletin
747-23A2628 RB.
48 months.-At the location(s) where part num-
ber 100-602549-000 is installed,
repeat the DET of the SATCOM
High Gain Antenna Adapter Plate
for corrosion. (d)
CONDITION 10: NO
CORROSION FOUND
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Original Issue: April 18, 2025
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REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT

### Page 18

Group 1, Configuration 3-4:
Table 4: Satellite Communications (SATCOM) High Gain Antenna Adapter Plate Inspection
Repeat Interval
(Not to Exceed)
Boeing Recommended
Compliance Time (Whichever
Occurs Later)
ActionCondition
-Before further flight.OPTION 1 (ACTION 1): Repair the
SATCOM High Gain Antenna
Adapter Plate.
CONDITION 11: ANY
CORROSION FOUND
THAT IS LESS THAN
OR EQUAL TO 0.005
INCH IN DEPTH (a) 48 months.-OPTION 1 (ACTION 2): At the lo-cation(s) where part number 100-
602549-000 is installed, repeat the
DET of the SATCOM High Gain
Antenna Adapter Plate for corro-
sion. (d)
-Before further flight.OPTION 2 (ACTION 1): Replace
the SATCOM High Gain Antenna
Adapter Plate with a serviceable
SATCOM High Gain Antenna
Adapter Plate. (b)(c)
48 months.-OPTION 2 (ACTION 2): At the lo-
cation(s) where part number 100-
602549-000 is installed, repeat the
DET of the SATCOM High Gain
Antenna Adapter Plate for corro-
sion. (d)
-Before further flight.OPTION 3 (ACTION 1): Replace
the SATCOM High Gain Antenna
Adapter Plate with a new SATCOM
High Gain Antenna Adapter Plate.
(c)
96 months.-OPTION 3 (ACTION 2): At the lo-
cation(s) where part number 100-
602549-000 is installed, repeat the
DET of the SATCOM High Gain
Antenna Adapter Plate for corro-
sion. (d)
Export Controlled ECCN: 9E991
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Original Issue: April 18, 2025
747-23A2628 RB
18 of 36
REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT

### Page 19

Group 1, Configuration 3-4:
Table 4: Satellite Communications (SATCOM) High Gain Antenna Adapter Plate Inspection
Repeat Interval
(Not to Exceed)
Boeing Recommended
Compliance Time (Whichever
Occurs Later)
ActionCondition
-Before further flight.OPTION 1 (ACTION 1): Replace
the SATCOM High Gain Antenna
Adapter Plate with a serviceable
SATCOM High Gain Antenna
Adapter Plate. (b)(c)
CONDITION 12: ANY
CORROSION FOUND
THAT IS GREATER
THAN 0.005 INCH IN
DEPTH (a)
48 months.-OPTION 1 (ACTION 2): At the lo-
cation(s) where part number 100-
602549-000 is installed, repeat the
DET of the SATCOM High Gain
Antenna Adapter Plate for corro-
sion. (d)
-Before further flight.OPTION 2 (ACTION 1): Replace
the SATCOM High Gain Antenna
Adapter Plate with a new SATCOM
High Gain Antenna Adapter Plate.
(c)
96 months.-OPTION 2 (ACTION 2): At the lo-
cation(s) where part number 100-
602549-000 is installed, repeat the
DET of the SATCOM High Gain
Antenna Adapter Plate for corro-
sion. (d)
(a) Adapter plate corrosion damage limitations can be found in CMC Electronics CMM 23-15-06, Original Issue,
dated April 16, 2024, or later revisions.
(b) A serviceable SATCOM adapter plate is one that has been inspected for corrosion and applicable on-
condition corrective actions has been done in accordance with Requirements Bulletin 747-23A2628 RB.
(c) Any airplane that installs SATCOM High Gain Antenna Adapter Plate part number 100-602074-000 and
does not install part number 100-602549-000 after the Original Issue date of Requirements Bulletin 747-
23A2628 RB, must comply with the requirements specified in Group 1, Configuration 2.
(d) The removal of SATCOM High Gain Antenna Adapter Plate part number 100-602549-000 after the Original
Issue date of Requirements Bulletin 747-23A2628 RB terminates the repeat DET inspection at the location(s)
where part number 100-602549-000 was removed.
4. APPROVAL
This Requirements Bulletin was examined by the Federal Aviation Administration (FAA). The changes
specified in this document comply with the applicable regulations and are FAA approved, as well as European
Union Aviation Safety Agency (EASA) approved for all EASA approved airplanes listed in this Requirements
Bulletin effectivity. This document and its approval were based on the airplane in its original Boeing delivery
configuration or as modified by other Boeing changes.
Export Controlled ECCN: 9E991
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Original Issue: April 18, 2025
747-23A2628 RB
19 of 36
REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT

### Page 20

If an airplane has a non-Boeing modification or repair that affects a component or system also affected by
this Requirements Bulletin, the operator is responsible for obtaining appropriate regulatory agency approval
before incorporating this Requirements Bulletin.
Export Controlled ECCN: 9E991
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Original Issue: April 18, 2025
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20 of 36
REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT

### Page 21

5.    ACCOMPLISHMENT INSTRUCTIONS
A. GENERAL INFORMATION
NOTE: 1. This is an Enhanced Required for Compliance document. There will be a separate
Service Bulletin (SB) and a separate Requirements Bulletin (RB). If an RB is mandated
by an Airworthiness Directive (AD), then all applicable requirements specified in the
RB must be done. In the RB, the "Refer to the listed procedures..." column of the
table(s) in the Work Instructions is for reference only. The procedures in that column
are not required by the AD and are for guidance only. For the related SB, some
locations are marked RC Start and RC End to identify the requirements that are
restated from the RB. For the related SB, the areas between RC Start and RC End,
including sub-steps and any figures identified between RC Start and RC End, must
be done to comply with the AD. Therefore, an Alternative Method of Compliance
(AMOC) is required for any deviations to steps between RC Start and RC End,
including substeps and identified figures. For the related SB, the steps not between
RC Start and RC End may be deviated from using accepted methods in accordance
with the operator's maintenance or inspection program without obtaining approval
of an AMOC; this is provided that the steps between RC Start and RC End, including
sub-steps and identified figures, can still be done as specified, and the airplane can
be put back in an airworthy condition. Figures not required for compliance are omitted
from the RB.
2. This is an Enhanced Required for Compliance document. The Boeing processes
used to create the Service Bulletin (SB) and the Requirements Bulletin (RB) ensure
that the information between "RC Start" and "RC End" in the SB are identical to the
information in the same sections (Compliance, Work Instructions...) of the RB which
the SB refers to as the related document.
3. The compliance times for the actions in WORK INSTRUCTIONS are in Compliance.
4. Unless shown differently, these dimensions and tolerances are used:
– Linear dimensions are in inches
– Tolerance on linear dimensions, other than rivet and bolt edge margins, is plus
or minus 0.03 inch
– Tolerance on rivet and bolt edge margin is plus or minus 0.05 inch
– Angular tolerance is plus or minus 2 degrees
– Hole dimensions for standard solid rivets and fasteners are in Structural Repair
Manual (SRM) Chapter 51
– Torque Values:
— Values for structural fasteners are given in 747 Structural Repair Manual,
Chapter 51.
— Values for airframe maintenance tasks are included in Chapter 20 of 747
Aircraft Maintenance Manual (AMM).
— Values for electrical maintenance tasks are included in Chapter 20 of
Standard Wiring Practices Manual (SWPM).
— Values for engine maintenance tasks are included in Chapter 70 of 747
Aircraft Maintenance Manual (AMM).
— Non-standard torque values for maintenance tasks are included in the
applicable installation step.
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Original Issue: April 18, 2025
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REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT

### Page 22

5. These work instructions refer to procedures included in other Boeing documents.
When the words "refer to" are used and the operator has an accepted alternative
procedure, the accepted alternative procedure can be used. When the words "in
accordance with" are included in the instruction, the procedure in the Boeing document
must be used.
6. Where the work instructions include installation of a kept part, a new or serviceable
part with the same part number can be installed as an alternative to the kept part.
7. If it is necessary to remove more parts for access, you can remove those parts. If
you can get access without removing identified parts, it is not necessary to remove
all of the identified parts. Jacking and shoring limitations must be observed.
8. Use the approved fastener, process and material substitutions in accordance with
SRM Chapter 51.
9. A Detailed Inspection (DET) is defined as: An intensive examination of a specific
item, installation or assembly to detect damage, failure or irregularity. This could
include tactile assessment in which a component or assembly can be checked for
tightness/security. Available lighting is normally supplemented with a direct source
of good lighting at an intensity deemed appropriate. Inspection aids such as mirrors
and magnifying lenses may be necessary. Surface cleaning and elaborate access
procedures may be required.
10. When more than one OPTION is given for a CONDITION, do only one of the OPTION
numbers. When more than one ACTION is given for a CONDITION or an OPTION,
do all of the ACTION numbers for that CONDITION or OPTION.
11. Use of colors in Figures is based on guidance from the ATA e-Business Program
(ATA) iSpec 2200.
B. WORK INSTRUCTIONS
Actions Required For Compliance:
1. Requirements
Group 1, Configuration 1:
No work is necessary.
Any airplane that installs SATCOM High Gain Antenna Adapter Plate part number 100-602074-000
and does not install part number 100-602549-000 after the Original Issue date of Requirements
Bulletin 747-23A2628 RB, must comply with the requirements specified in Group 1, Configuration
2.
Any airplane that installs SATCOM High Gain Antenna Adapter Plate part number 100-602549-000
and does not install part number 100-602074-000 after the Original Issue date of Requirements
Bulletin 747-23A2628 RB, must comply with the requirements specified in Group 1, Configuration
3.
Any airplane that installs SATCOM High Gain Antenna Adapter Plate part number 100-602074-000
and part number 100-602549-000 after the Original Issue date of Requirements Bulletin
747-23A2628 RB, must comply with the requirements specified in Group 1, Configuration 4.
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: April 18, 2025
747-23A2628 RB
22 of 36
REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT

### Page 23

Group 1, Configuration 2, 4:
Table 1: Satellite Communications (SATCOM) High Gain Antenna Adapter Plate Inspection
Refer to the listed pro-
cedures in SB 747-
23A2628 Original Issue
or later approved revi-
sions as an accepted
procedure.
Method of
Compliance
ActionCondition
Do PART 1: SATCOM
HIGH GAIN ANTENNA
ADAPTER PLATE RE-
MOVAL
-At the location(s) where part number 100-
602074-000 is installed, do a Detailed Inspec-
tion (DET) of the SATCOM High Gain Antenna
Adapter Plate for corrosion.
Airplanes with SAT-
COM High Gain An-
tenna Adapter
Plate(s) with part
number 100-602074-
000 that have been
installed for 20 years
or more as of the
Original Issue date of
Requirements Bulletin
747-23A2628 RB, or
the installation date
cannot be deter-
mined.
-FIGURE 1
Do PART 2: KEPT SAT-
COM HIGH GAIN AN-
TENNA ADAPTER
PLATE INSTALLATION
-At the location(s) where part number 100-
602074-000 is installed, repeat the DET of the
SATCOM High Gain Antenna Adapter Plate for
corrosion. (d)
CONDITION 1: NO
CORROSION
FOUND
Do PART 4: CLOSE
ACCESS
-
-FIGURE 1
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REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT

### Page 24

Group 1, Configuration 2, 4:
Table 1: Satellite Communications (SATCOM) High Gain Antenna Adapter Plate Inspection
Refer to the listed pro-
cedures in SB 747-
23A2628 Original Issue
or later approved revi-
sions as an accepted
procedure.
Method of
Compliance
ActionCondition
Refer to CMC Electron-
ics CMM 23-15-06 Origi-
nal Issue, dated April 16,
2024, or later revision as
an accepted procedure.
-OPTION 1 (ACTION 1): Repair the SATCOM
High Gain Antenna Adapter Plate.
CONDITION 2: ANY
CORROSION
FOUND THAT IS
LESS THAN OR
EQUAL TO 0.005
INCH IN DEPTH (a) Do PART 2: KEPT SAT-
COM HIGH GAIN AN-
TENNA ADAPTER
PLATE INSTALLATION
-
Do PART 4: CLOSE
ACCESS
-
-FIGURE 1OPTION 1 (ACTION 2): At the location(s)
where part number 100-602074-000 is installed,
repeat the DET of the SATCOM High Gain
Antenna Adapter Plate for corrosion. (d)
Do PART 3: SATCOM
HIGH GAIN ANTENNA
ADAPTER PLATE RE-
PLACEMENT
-OPTION 2 (ACTION 1): Replace the SATCOM
High Gain Antenna Adapter Plate with a service-
able SATCOM High Gain Antenna Adapter
Plate. (b)(c)
Do PART 4: CLOSE
ACCESS
-
-FIGURE 1OPTION 2 (ACTION 2): At the location(s)
where part number 100-602074-000 is installed,
repeat the DET of the SATCOM High Gain
Antenna Adapter Plate for corrosion. (d)
Do PART 3: SATCOM
HIGH GAIN ANTENNA
ADAPTER PLATE RE-
PLACEMENT
-OPTION 3 (ACTION 1): Replace the SATCOM
High Gain Antenna Adapter Plate with a new
SATCOM High Gain Antenna Adapter Plate.
(c)
Do PART 4: CLOSE
ACCESS
-
-FIGURE 1OPTION 3 (ACTION 2): At the location(s)
where part number 100-602074-000 is installed,
repeat the DET of the SATCOM High Gain
Antenna Adapter Plate for corrosion. (d)
Export Controlled ECCN: 9E991
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Original Issue: April 18, 2025
747-23A2628 RB
24 of 36
REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT

### Page 25

Group 1, Configuration 2, 4:
Table 1: Satellite Communications (SATCOM) High Gain Antenna Adapter Plate Inspection
Refer to the listed pro-
cedures in SB 747-
23A2628 Original Issue
or later approved revi-
sions as an accepted
procedure.
Method of
Compliance
ActionCondition
Do PART 3: SATCOM
HIGH GAIN ANTENNA
ADAPTER PLATE RE-
PLACEMENT
-OPTION 1 (ACTION 1): Replace the SATCOM
High Gain Antenna Adapter Plate with a service-
able SATCOM High Gain Antenna Adapter
Plate. (b)(c)
CONDITION 3: ANY
CORROSION
FOUND THAT IS
GREATER THAN
0.005 INCH IN
DEPTH (a) Do PART 4: CLOSEACCESS-
-FIGURE 1OPTION 1 (ACTION 2): At the location(s)
where part number 100-602074-000 is installed,
repeat the DET of the SATCOM High Gain
Antenna Adapter Plate for corrosion. (d)
Do PART 3: SATCOM
HIGH GAIN ANTENNA
ADAPTER PLATE RE-
PLACEMENT
-OPTION 2 (ACTION 1): Replace the SATCOM
High Gain Antenna Adapter Plate with a new
SATCOM High Gain Antenna Adapter Plate.
(c)
Do PART 4: CLOSE
ACCESS
-
-FIGURE 1OPTION 2 (ACTION 2): At the location(s)
where part number 100-602074-000 is installed,
repeat the DET of the SATCOM High Gain
Antenna Adapter Plate for corrosion. (d)
(a) Adapter plate corrosion damage limitations can be found in CMC Electronics CMM 23-15-06, Original Issue,
dated April 16, 2024, or later revisions.
(b) A serviceable SATCOM adapter plate is one that has been inspected for corrosion and applicable on-
condition corrective actions has been done in accordance with Requirements Bulletin 747-23A2628 RB.
(c) Any airplane that installs SATCOM High Gain Antenna Adapter Plate part number 100-602549-000 and
does not install part number 100-602074-000 after the Original Issue date of Requirements Bulletin 747-
23A2628 RB, must comply with the requirements specified in Group 1, Configuration 3.
(d) The removal of SATCOM High Gain Antenna Adapter Plate part number 100-602074-000 after the Original
Issue date of Requirements Bulletin 747-23A2628 RB terminates the repeat DET inspection at the location(s)
where part number 100-602074-000 was removed.
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: April 18, 2025
747-23A2628 RB
25 of 36
REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT

### Page 26

Group 1, Configuration 2, 4:
Table 2: Satellite Communications (SATCOM) High Gain Antenna Adapter Plate Inspection
Refer to the listed pro-
cedures in SB 747-
23A2628 Original Issue
or later approved revi-
sions as an accepted
procedure.
Method of
Compliance
ActionCondition
Do PART 1: SATCOM
HIGH GAIN ANTENNA
ADAPTER PLATE RE-
MOVAL
-At the location(s) where part number 100-
602074-000 is installed, do a Detailed Inspec-
tion (DET) of the SATCOM High Gain Antenna
Adapter Plate for corrosion.
Airplanes with SAT-
COM High Gain An-
tenna Adapter
Plate(s) with part
number 100-602074-
000 that have been
installed for less than
20 years as of the
Original Issue date of
Requirements Bulletin
747-23A2628 RB.
-FIGURE 1
Do PART 2: KEPT SAT-
COM HIGH GAIN AN-
TENNA ADAPTER
PLATE INSTALLATION
-At the location(s) where part number 100-
602074-000 is installed, repeat the DET of the
SATCOM High Gain Antenna Adapter Plate for
corrosion. (d)
CONDITION 4: NO
CORROSION
FOUND
Do PART 4: CLOSE
ACCESS
-
-FIGURE 1
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Original Issue: April 18, 2025
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26 of 36
REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT

### Page 27

Group 1, Configuration 2, 4:
Table 2: Satellite Communications (SATCOM) High Gain Antenna Adapter Plate Inspection
Refer to the listed pro-
cedures in SB 747-
23A2628 Original Issue
or later approved revi-
sions as an accepted
procedure.
Method of
Compliance
ActionCondition
Refer to CMC Electron-
ics CMM 23-15-06 Origi-
nal Issue, dated April 16,
2024, or later revision as
an accepted procedure.
-OPTION 1 (ACTION 1): Repair the SATCOM
High Gain Antenna Adapter Plate.
CONDITION 5: ANY
CORROSION
FOUND THAT IS
LESS THAN OR
EQUAL TO 0.005
INCH IN DEPTH (a) Do PART 2: KEPT SAT-
COM HIGH GAIN AN-
TENNA ADAPTER
PLATE INSTALLATION
-
Do PART 4: CLOSE
ACCESS
-
-FIGURE 1OPTION 1 (ACTION 2): At the location(s)
where part number 100-602074-000 is installed,
repeat the DET of the SATCOM High Gain
Antenna Adapter Plate for corrosion. (d)
Do PART 3: SATCOM
HIGH GAIN ANTENNA
ADAPTER PLATE RE-
PLACEMENT
-OPTION 2 (ACTION 1): Replace the SATCOM
High Gain Antenna Adapter Plate with a service-
able SATCOM High Gain Antenna Adapter
Plate. (b)(c)
Do PART 4: CLOSE
ACCESS
-
-FIGURE 1OPTION 2 (ACTION 2): At the location(s)
where part number 100-602074-000 is installed,
repeat the DET of the SATCOM High Gain
Antenna Adapter Plate for corrosion. (d)
Do PART 3: SATCOM
HIGH GAIN ANTENNA
ADAPTER PLATE RE-
PLACEMENT
-OPTION 3 (ACTION 1): Replace the SATCOM
High Gain Antenna Adapter Plate with a new
SATCOM High Gain Antenna Adapter Plate.
(c)
Do PART 4: CLOSE
ACCESS
-
-FIGURE 1OPTION 3 (ACTION 2): At the location(s)
where part number 100-602074-000 is installed,
repeat the DET of the SATCOM High Gain
Antenna Adapter Plate for corrosion. (d)
Export Controlled ECCN: 9E991
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Original Issue: April 18, 2025
747-23A2628 RB
27 of 36
REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT

### Page 28

Group 1, Configuration 2, 4:
Table 2: Satellite Communications (SATCOM) High Gain Antenna Adapter Plate Inspection
Refer to the listed pro-
cedures in SB 747-
23A2628 Original Issue
or later approved revi-
sions as an accepted
procedure.
Method of
Compliance
ActionCondition
Do PART 3: SATCOM
HIGH GAIN ANTENNA
ADAPTER PLATE RE-
PLACEMENT
-OPTION 1 (ACTION 1): Replace the SATCOM
High Gain Antenna Adapter Plate with a service-
able SATCOM High Gain Antenna Adapter
Plate. (b)(c)
CONDITION 6: ANY
CORROSION
FOUND THAT IS
GREATER THAN
0.005 INCH IN
DEPTH (a) Do PART 4: CLOSEACCESS-
-FIGURE 1OPTION 1 (ACTION 2): At the location(s)
where part number 100-602074-000 is installed,
repeat the DET of the SATCOM High Gain
Antenna Adapter Plate for corrosion. (d)
Do PART 3: SATCOM
HIGH GAIN ANTENNA
ADAPTER PLATE RE-
PLACEMENT
-OPTION 2 (ACTION 1): Replace the SATCOM
High Gain Antenna Adapter Plate with a new
SATCOM High Gain Antenna Adapter Plate.
(c)
Do PART 4: CLOSE
ACCESS
-
-FIGURE 1OPTION 2 (ACTION 2): At the location(s)
where part number 100-602074-000 is installed,
repeat the DET of the SATCOM High Gain
Antenna Adapter Plate for corrosion. (d)
(a) Adapter plate corrosion damage limitations can be found in CMC Electronics CMM 23-15-06, Original Issue,
dated April 16, 2024, or later revisions.
(b) A serviceable SATCOM adapter plate is one that has been inspected for corrosion and applicable on-
condition corrective actions has been done in accordance with Requirements Bulletin 747-23A2628 RB.
(c) Any airplane that installs SATCOM High Gain Antenna Adapter Plate part number 100-602549-000 and
does not install part number 100-602074-000 after the Original Issue date of Requirements Bulletin 747-
23A2628 RB, must comply with the requirements specified in Group 1, Configuration 3.
(d) The removal of SATCOM High Gain Antenna Adapter Plate part number 100-602074-000 after the Original
Issue date of Requirements Bulletin 747-23A2628 RB terminates the repeat DET inspection at the location(s)
where part number 100-602074-000 was removed.
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: April 18, 2025
747-23A2628 RB
28 of 36
REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT

### Page 29

Group 1, Configuration 3-4:
Table 3: Satellite Communications (SATCOM) High Gain Antenna Adapter Plate Inspection
Refer to the listed pro-
cedures in SB 747-
23A2628 Original Issue
or later approved revi-
sions as an accepted
procedure.
Method of
Compliance
ActionCondition
Do PART 1: SATCOM
HIGH GAIN ANTENNA
ADAPTER PLATE RE-
MOVAL
-At the location(s) where part number 100-
602549-000 is installed, do a Detailed Inspec-
tion (DET) of the SATCOM High Gain Antenna
Adapter Plate for corrosion.
Airplanes with SAT-
COM High Gain An-
tenna Adapter
Plate(s) with part
number 100-602549-
000 that have been
installed for 20 years
or more as of the
Original Issue date of
Requirements Bulletin
747-23A2628 RB, or
the installation date
cannot be deter-
mined.
-FIGURE 2
Do PART 2: KEPT SAT-
COM HIGH GAIN AN-
TENNA ADAPTER
PLATE INSTALLATION
-At the location(s) where part number 100-
602549-000 is installed, repeat the DET of the
SATCOM High Gain Antenna Adapter Plate for
corrosion. (d)
CONDITION 7: NO
CORROSION
FOUND
Do PART 4: CLOSE
ACCESS
-
-FIGURE 2
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: April 18, 2025
747-23A2628 RB
29 of 36
REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT

### Page 30

Group 1, Configuration 3-4:
Table 3: Satellite Communications (SATCOM) High Gain Antenna Adapter Plate Inspection
Refer to the listed pro-
cedures in SB 747-
23A2628 Original Issue
or later approved revi-
sions as an accepted
procedure.
Method of
Compliance
ActionCondition
Refer to CMC Electron-
ics CMM 23-15-06 Origi-
nal Issue, dated April 16,
2024, or later revision as
an accepted procedure.
-OPTION 1 (ACTION 1): Repair the SATCOM
High Gain Antenna Adapter Plate.
CONDITION 8: ANY
CORROSION
FOUND THAT IS
LESS THAN OR
EQUAL TO 0.005
INCH IN DEPTH (a) Do PART 2: KEPT SAT-
COM HIGH GAIN AN-
TENNA ADAPTER
PLATE INSTALLATION
-
Do PART 4: CLOSE
ACCESS
-
-FIGURE 2OPTION 1 (ACTION 2): At the location(s)
where part number 100-602549-000 is installed,
repeat the DET of the SATCOM High Gain
Antenna Adapter Plate for corrosion. (d)
Do PART 3: SATCOM
HIGH GAIN ANTENNA
ADAPTER PLATE RE-
PLACEMENT
-OPTION 2 (ACTION 1): Replace the SATCOM
High Gain Antenna Adapter Plate with a service-
able SATCOM High Gain Antenna Adapter
Plate. (b)(c)
Do PART 4: CLOSE
ACCESS
-
-FIGURE 2OPTION 2 (ACTION 2): At the location(s)
where part number 100-602549-000 is installed,
repeat the DET of the SATCOM High Gain
Antenna Adapter Plate for corrosion. (d)
Do PART 3: SATCOM
HIGH GAIN ANTENNA
ADAPTER PLATE RE-
PLACEMENT
-OPTION 3 (ACTION 1): Replace the SATCOM
High Gain Antenna Adapter Plate with a new
SATCOM High Gain Antenna Adapter Plate.
(c)
Do PART 4: CLOSE
ACCESS
-
-FIGURE 2OPTION 3 (ACTION 2): At the location(s)
where part number 100-602549-000 is installed,
repeat the DET of the SATCOM High Gain
Antenna Adapter Plate for corrosion. (d)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: April 18, 2025
747-23A2628 RB
30 of 36
REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT

### Page 31

Group 1, Configuration 3-4:
Table 3: Satellite Communications (SATCOM) High Gain Antenna Adapter Plate Inspection
Refer to the listed pro-
cedures in SB 747-
23A2628 Original Issue
or later approved revi-
sions as an accepted
procedure.
Method of
Compliance
ActionCondition
Do PART 3: SATCOM
HIGH GAIN ANTENNA
ADAPTER PLATE RE-
PLACEMENT
-OPTION 1 (ACTION 1): Replace the SATCOM
High Gain Antenna Adapter Plate with a service-
able SATCOM High Gain Antenna Adapter
Plate. (b)(c)
CONDITION 9: ANY
CORROSION
FOUND THAT IS
GREATER THAN
0.005 INCH IN
DEPTH (a) Do PART 4: CLOSEACCESS-
-FIGURE 2OPTION 1 (ACTION 2): At the location(s)
where part number 100-602549-000 is installed,
repeat the DET of the SATCOM High Gain
Antenna Adapter Plate for corrosion. (d)
Do PART 3: SATCOM
HIGH GAIN ANTENNA
ADAPTER PLATE RE-
PLACEMENT
-OPTION 2 (ACTION 1): Replace the SATCOM
High Gain Antenna Adapter Plate with a new
SATCOM High Gain Antenna Adapter Plate.
(c)
Do PART 4: CLOSE
ACCESS
-
-FIGURE 2OPTION 2 (ACTION 2): At the location(s)
where part number 100-602549-000 is installed,
repeat the DET of the SATCOM High Gain
Antenna Adapter Plate for corrosion. (d)
(a) Adapter plate corrosion damage limitations can be found in CMC Electronics CMM 23-15-06, Original Issue,
dated April 16, 2024, or later revisions.
(b) A serviceable SATCOM adapter plate is one that has been inspected for corrosion and applicable on-
condition corrective actions has been done in accordance with Requirements Bulletin 747-23A2628 RB.
(c) Any airplane that installs SATCOM High Gain Antenna Adapter Plate part number 100-602074-000 and
does not install part number 100-602549-000 after the Original Issue date of Requirements Bulletin 747-
23A2628 RB, must comply with the requirements specified in Group 1, Configuration 2.
(d) The removal of SATCOM High Gain Antenna Adapter Plate part number 100-602549-000 after the Original
Issue date of Requirements Bulletin 747-23A2628 RB terminates the repeat DET inspection at the location(s)
where part number 100-602549-000 was removed.
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: April 18, 2025
747-23A2628 RB
31 of 36
REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT

### Page 32

Group 1, Configuration 3-4:
Table 4: Satellite Communications (SATCOM) High Gain Antenna Adapter Plate Inspection
Refer to the listed pro-
cedures in SB 747-
23A2628 Original Issue
or later approved revi-
sions as an accepted
procedure.
Method of
Compliance
ActionCondition
Do PART 1: SATCOM
HIGH GAIN ANTENNA
ADAPTER PLATE RE-
MOVAL
-At the location(s) where part number 100-
602549-000 is installed, do a Detailed Inspec-
tion (DET) of the SATCOM High Gain Antenna
Adapter Plate for corrosion.
Airplanes with SAT-
COM High Gain An-
tenna Adapter
Plate(s) with part
number 100-602549-
000 that have been
installed for less than
20 years as of the
Original Issue date of
Requirements Bulletin
747-23A2628 RB.
-FIGURE 2
Do PART 2: KEPT SAT-
COM HIGH GAIN AN-
TENNA ADAPTER
PLATE INSTALLATION
-At the location(s) where part number 100-
602549-000 is installed, repeat the DET of the
SATCOM High Gain Antenna Adapter Plate for
corrosion. (d)
CONDITION 10: NO
CORROSION
FOUND
Do PART 4: CLOSE
ACCESS
-
-FIGURE 2
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: April 18, 2025
747-23A2628 RB
32 of 36
REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT

### Page 33

Group 1, Configuration 3-4:
Table 4: Satellite Communications (SATCOM) High Gain Antenna Adapter Plate Inspection
Refer to the listed pro-
cedures in SB 747-
23A2628 Original Issue
or later approved revi-
sions as an accepted
procedure.
Method of
Compliance
ActionCondition
Refer to CMC Electron-
ics CMM 23-15-06 Origi-
nal Issue, dated April 16,
2024, or later revision as
an accepted procedure.
-OPTION 1 (ACTION 1): Repair the SATCOM
High Gain Antenna Adapter Plate.
CONDITION 11: ANY
CORROSION
FOUND THAT IS
LESS THAN OR
EQUAL TO 0.005
INCH IN DEPTH (a) Do PART 2: KEPT SAT-
COM HIGH GAIN AN-
TENNA ADAPTER
PLATE INSTALLATION
-
Do PART 4: CLOSE
ACCESS
-
-FIGURE 2OPTION 1 (ACTION 2): At the location(s)
where part number 100-602549-000 is installed,
repeat the DET of the SATCOM High Gain
Antenna Adapter Plate for corrosion. (d)
Do PART 3: SATCOM
HIGH GAIN ANTENNA
ADAPTER PLATE RE-
PLACEMENT
-OPTION 2 (ACTION 1): Replace the SATCOM
High Gain Antenna Adapter Plate with a service-
able SATCOM High Gain Antenna Adapter
Plate. (b)(c)
Do PART 4: CLOSE
ACCESS
-
-FIGURE 2OPTION 2 (ACTION 2): At the location(s)
where part number 100-602549-000 is installed,
repeat the DET of the SATCOM High Gain
Antenna Adapter Plate for corrosion. (d)
Do PART 3: SATCOM
HIGH GAIN ANTENNA
ADAPTER PLATE RE-
PLACEMENT
-OPTION 3 (ACTION 1): Replace the SATCOM
High Gain Antenna Adapter Plate with a new
SATCOM High Gain Antenna Adapter Plate.
(c)
Do PART 4: CLOSE
ACCESS
-
-FIGURE 2OPTION 3 (ACTION 2): At the location(s)
where part number 100-602549-000 is installed,
repeat the DET of the SATCOM High Gain
Antenna Adapter Plate for corrosion. (d)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: April 18, 2025
747-23A2628 RB
33 of 36
REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT

### Page 34

Group 1, Configuration 3-4:
Table 4: Satellite Communications (SATCOM) High Gain Antenna Adapter Plate Inspection
Refer to the listed pro-
cedures in SB 747-
23A2628 Original Issue
or later approved revi-
sions as an accepted
procedure.
Method of
Compliance
ActionCondition
Do PART 3: SATCOM
HIGH GAIN ANTENNA
ADAPTER PLATE RE-
PLACEMENT
-OPTION 1 (ACTION 1): Replace the SATCOM
High Gain Antenna Adapter Plate with a service-
able SATCOM High Gain Antenna Adapter
Plate. (b)(c)
CONDITION 12: ANY
CORROSION
FOUND THAT IS
GREATER THAN
0.005 INCH IN
DEPTH (a) Do PART 4: CLOSEACCESS-
-FIGURE 2OPTION 1 (ACTION 2): At the location(s)
where part number 100-602549-000 is installed,
repeat the DET of the SATCOM High Gain
Antenna Adapter Plate for corrosion. (d)
Do PART 3: SATCOM
HIGH GAIN ANTENNA
ADAPTER PLATE RE-
PLACEMENT
-OPTION 2 (ACTION 1): Replace the SATCOM
High Gain Antenna Adapter Plate with a new
SATCOM High Gain Antenna Adapter Plate.
(c)
Do PART 4: CLOSE
ACCESS
-
-FIGURE 2OPTION 2 (ACTION 2): At the location(s)
where part number 100-602549-000 is installed,
repeat the DET of the SATCOM High Gain
Antenna Adapter Plate for corrosion. (d)
(a) Adapter plate corrosion damage limitations can be found in CMC Electronics CMM 23-15-06, Original Issue,
dated April 16, 2024, or later revisions.
(b) A serviceable SATCOM adapter plate is one that has been inspected for corrosion and applicable on-
condition corrective actions has been done in accordance with Requirements Bulletin 747-23A2628 RB.
(c) Any airplane that installs SATCOM High Gain Antenna Adapter Plate part number 100-602074-000 and
does not install part number 100-602549-000 after the Original Issue date of Requirements Bulletin 747-
23A2628 RB, must comply with the requirements specified in Group 1, Configuration 2.
(d) The removal of SATCOM High Gain Antenna Adapter Plate part number 100-602549-000 after the Original
Issue date of Requirements Bulletin 747-23A2628 RB terminates the repeat DET inspection at the location(s)
where part number 100-602549-000 was removed.
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: April 18, 2025
747-23A2628 RB
34 of 36
REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT

### Page 35

This Figure applies only to: Group 1, Configuration 2, 4.
The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY
numbers shown below are the number of parts necessary for this figure.
More DataQtyIdentificationNameTaskStep
(a)-100-602074-000SATCOM HIGH GAIN
ANTENNA ADAPTER
PLATE
Inspect1
(a) Do a Detailed Inspection (DET) of the SATCOM High Gain Antenna Adapter Plate for corrosion.
FIGURE 1: SATELLITE COMMUNICATIONS (SATCOM) HIGH GAIN ANTENNA - ADAPTER PLATE -
DETAILED INSPECTION
(SHEET 1 OF 1)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: April 18, 2025
747-23A2628 RB
35 of 36
REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT

### Page 36

This Figure applies only to: Group 1, Configuration 3-4.
The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY
numbers shown below are the number of parts necessary for this figure.
More DataQtyIdentificationNameTaskStep
(a)-100-602549-000SATCOM HIGH GAIN
ANTENNA ADAPTER
PLATE
Inspect1
(a) Do a Detailed Inspection (DET) of the SATCOM High Gain Antenna Adapter Plate for corrosion.
FIGURE 2: SATELLITE COMMUNICATIONS (SATCOM) HIGH GAIN ANTENNA - ADAPTER PLATE -
DETAILED INSPECTION
(SHEET 1 OF 1)
Export Controlled ECCN: 9E991
See page 1 for details
Original Issue: April 18, 2025
747-23A2628 RB
36 of 36
REQUIREMENTS BULLETIN 747-23A2628
ALERTALERT

---
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